Hello lancergsr1,
In this situation your options are very limited. If you do not have a part of your SharePoint site that is available externally, then the process would need to be manual. If, on the other side you do have a portion of your site available externally, you could submit to a different library, and then run a SharePoint workflow to move the form to the desired location. You could also have an email submit from the filler that could send the form to a specified email, where the person who is internal could then open and "resubmit" to your SharePoint library.
Hope that helps!
Bre
Bre Huston
| Project Manager
Qdabra® Software / InfoPathDev.com / FormsQuo / 877.544.2389 main / 425.318.7843 direct
Business Process Automation for Everyone – Streamline data gathering to
turn process into knowledge.™